Nitriding barrel is also the most common barrel, material composition: SACM645 alloy steel; 38CrMoAla alloy structural steel, Jinyang nitride barrel after quenching, forming, ion nitriding, shaping, soft nitriding (secondary nitriding) . The inner bore surface of the barrel has hardness and wear resistance. The screw-nitriding barrel is suitable for general plastics such as ordinary plastics, PP, ABS, PS, PE, EVA, PVC, PO, and PU.